Fourths to joseph h



(No Model.)

J. F. KESTER. REGULATOR FOR DYNAMO ELECTRIC MACHINES.

No. 397,006. Patented Jan. 29, 1889.

lea 10ml ea/Caz, (Q5 9% M m PETERS. FhelD-hilwgrapher. Waihmgtcn. ac

UNITED STATES PATENT OEEicE.

JESSE F. KESTER, OF TERRE I'IAUTE, IXDIAXA, ASSIGXOR OF THREE- FOI RTHS TO JOSEPH II. BRIGGS, '01P SAME PLACE.

REGULATOR FOR DYNAMO=ELECTRIC MACHINES SPECIFICATION forming part of Letters Patent No. 397,006, dated January 29, 1889.

Application filed March 15, 1888. Serial No. 267,278. 1No mcdeld Te aZZ whom it may concern.-

' Be it known that I, JESSE l1. KEsTER, of Terre Haute, in the county of Yigo and State of Indiana, have invented certain new and useful Improvements in Regulators for Dynamo-Electric Machines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification.

This invention relates to an improved system of dynamo or motor regulation, whereby when the speed of a generator or motor reaches a predetermined maximum the machine will be so affected that its speed will be automatically retarded, so that the number of revolutions per minute of the armature-shaft or field-magnet, if that be the rotativc part, will be controlled.

The object of the invention is to produce a regulator of this character which will be reliable in action and may be adjusted at any time when the machine is not in operation to reduce the speed or current to any desired limit.

To these ends my invention consists in certain novel features of construction and combinations of parts more fully described hereinafter, and particularly pointed out in the claims; and my invention further consists in connecting one or more armature-coils in a normally-opcn short circuit, and a speedgovernor to operate a circuit-controller in cluded in said circuit, whereby when the machine rcaches a certain speed the circuit is closed by the controller operated upon by the governor and the armature-coils included in the regulatingcircuit are thrown into short circuit.

In the accompanying drawings, which ill ustrate my invention, Figure 1 is an enlarged sectional view of an extension of an armatureshaft provided with the centrifugal governor, and circuit-closer controlled thereby. is a cross-section of Fig.1 on line .i'a'. Fig. 3 is an elevation, partly broken away, of an armatureshaft, showing the connections becircuit closer.

tween the commutator-strips and the circuit controller. Fig. l is a view in diagram illustratin g the connectitms bet ween the armaturecoils, commutator, and circuit-controller.

I will first describe the construction of the governor, and will then set forth the circuit it may control to effect the R gulation of the machine.

I isa tubeol' insulatingmaterialas of hard rubber or any suitable compound. It is reduced at one en d and screw-threaded, as shown at 13. A screw-thread is tapped on the end of the armature-spindle and the hollow extension screwed on so as to make a firm connection. Circuit-closing arms 9 10 are supported in any suitable manner in the interior of the extension, as by arms 15. One of the circuit-closing arms, 9, is pivoted so as to be swung into contact with the other fixed arm, 10. A red, 8, spans the movable This rod is provided with T-shaped flanges or projections T at its upper end, which slide in slots i of a hollow support, 2, screwed or otherwise suitably secured to the extension 1. The flanges of rod 8 extend through the slot in the support and are pressed down by a coil-spring, 6, the other end of the spring bearing against a thumb-screw, A weight, 3, is arranged to slide over the support 2, and this weight is provided with a recess to accommodate the projecting flanges ot' the rod 8, as clearly shown in Fig. i. It will now be. evident that when the shaft to which the extension is secured is rotating under a high speed the weight 3 will be acted upon by centrifugal force and will compress the spring 0 against the tluunb-scrcw, lifting rod 8 and bringing the. two circuit-closing arms fl and it) into contact. It will also be evident that by adjusting the thumb-screw to or from the shaft the spring will be put upon more or less tension, and thcrct'm'e a higher or lower speed will be required to bring the arms 9 and 10 into contact.

In Fig. 4- the regulating-circnit is clearly illustrated, showing armature-coils 1 2 3 l and the commutator for the same in diagram. The stationary circuit-closing arm 10 is electrically connected by a conductor, 17, with any desired commutatorstrip-say strip No.

1and the movable circuit-closing arm 0 is also connected with another commutatorstripsay No. 3 by a conductor, 16. Thus it will be seen that when the arms 9 and 10 are brought into contact the number of .armature-coils in circuit with the commutatorstrips to which the arms 9 and 10 are electrically connected will discharge 011 short circuit through the circuitcloser, conductors 16 17, and the commutator-strips. Both the conductors extending from the arms Qand 10 are preferably carried through the hollow armature-shaft and out through a hole in the same, located between the comm ntator and armature to the desired commutatorstrips, as clearly shown in Fig. 3.

The great advantage offered by the arrange ment described is that the machine is regu lated by its speed and is not dependent on the strength of current. In such machines as depend on the latter mode of regulation the machine may be injured or burned out by the same current which affects the regulation.

I claim- 1. In a regulator for an electric motor or generator, the combination, with the armature and commutator segments, of a norm ally-open short circuit connecting two or more such segments, and a speed-governor attached to a rotating part of the machine for closing said short circuit, whereby the armature-coils corresponding to said segments may be thrown from the line into said short circuit when the machine reaches a definite speed.

2. In a dynamo or motor regulator, the com bination, with a hollow extension for an armature-shaft, of a circuit-controller located within the extension and comprising a stationary contact and a movable contact, and a speed governor extending from said extension and connected with and adapted to operate said movable contact of the circuit-controller, substantially as described.

3. In a dynamo or motor regulator, the combination of a regulating-circuit, a circuit-controller in said circuit, and a centrifugal governor comprising a sliding weight, a hollowslotted guide for said weight extending at right angles from the armature-shaft, a spring bearing on said weight, an adjusting-screw forvarying the tension of said spring, and a T-rod located in said guide and connecting the weight and circuit-controller, substan tially as described.

4. In a regulator, the combination of the armature-shaft, an extension of insulating material secured thereto, a speed-governor mounted on the extension, and a circuit-controller secured to the extension and connected with the governor, said circuit-controller being in a regulating-circuit, whereby when the machine reaches a definite speed the regulator will be brought into action.

5. A speed-governor for a generator or motor, comprising a hollow slotted support or guide, a sliding weight upon the same, a spring embracing the guide and bearing upon the weight, an adjusting-screw to regulate the tension of said spring upon the weight, a rod engaging the weight through the slots of the guide, and a circuit-closer connected to said rod, substantially as described.

In testimony thatI claim the foregoing as my own I affix my signature in presence of two witnesses.

JESSE F. KESTER;

lVitnesses:

HUBERT E. PEOK, M. P. CALLAN. 

